The aim of current work is to develop a mathematical model designed by Rabl for
compound parabolic collector (CPC) using tubular receiver instead of the flat receiver. The
simulation was carried out for reflection of direct and indirect solar radia
tion incident on
the compound parabolic collector.
The equations were evaluated using analytical geometry for calculating the Cartesian
coordinates of the reflecting surface, then the falling and reflected rays on the detector
were calculated. A MATLAB program was developed to generate the data and print the
reflected rays through the use of 10000 rays at random position according to the random
Monte Carlo simulation for each angle of the rays. We found that the optimum value of
half acceptance angle is 35.
This investigation showed that the efficiency of compound parabolic collector
decreases with increasing the radius and length of receiver at the same inlet temperature of
working fluid. Also showed that the efficiency of compound parabolic collector with
tubular receiver is higher than collector with flat receiver at the same conditions.
